As of no later than 6:00 p.m. November 19th, 2016, every 15-bit still life is synthesizable in fewer than 15 gliders!Thanks to everyone in this thread who has contributed syntheses (even just one), and a Caterpillar-sized shoutout to everyone who made Catagolue possible.

Last edited by BlinkerSpawn on November 19th, 2016, 8:29 pm, edited 59 times in total.

15.919 was listed as a 15G synthesis in mniemiec's post of Bob Shemyakin's improvements to the list.My comment was pointed more towards the use of "improved to 19" when the current best was 15 via that method.Also, it appears that 15.845 should never have been on the list to begin with, looking at that 9G synthesis that's the precursor to the full synthesis.

The first line of that is actually based on Bob's 7-glider synthesis of 15.845, which renders BlinkerSpawn's recent 16-glider synthesis obsolete (as well as improving everything that depended on it: Bob's 21-glider 15.918 plus the 3 jams and 5 molds). The remaining lines are my earlier syntheses.

mniemiec wrote:That method is basically just the previous one advanced 16 generations.

Not constructionwise, however. The secondary method (which you did) facilitates separate construction of the blinker and the junk reaction that the junk object from the primary method decays into as opposed to direct synthesis of the first object and appropriate accompanying gliders.

mniemiec wrote:The still-lifes can be made together, making this 6:

If you tire of assimilating 15-bit SL syntheses I'd like to see an expansion of the easily-constructible constellations list for things like this.

Not immediately related to the thread, but one of the early "wait, what?" mold variants in Catagolue involved a snake and python, so it's probably the one you mention. Looking over the soups, here's a way to make it in at most 9G; 8G or less is likely via constellations:

BlinkerSpawn wrote:If you tire of assimilating 15-bit SL syntheses I'd like to see an expansion of the easily-constructible constellations list for things like this.

I have about a thousand of these, which will take a while to get together. At the moment, they're high up on the list of things to work on once the next (hopefully 2016) update to my web site is finished.

Kayzan wrote:one of the early "wait, what?" mold variants in Catagolue involved a snake and python, so it's probably the one you mention. Looking over the soups, here's a way to make it in at most 9G; 8G or less is likely via constellations: ...

I count 11 (unless I missed something). Thus also the carrier+python one for 17. These both reduce the corresponding 16-bit still-lifes 16.2303 and 16.2302 by 1 to 12 and 17 respectively.

Goldtiger997 wrote:I found lots using gencols and used it to make a 13 glider synthesis of 13.390:

There is no 13.390. Did you mean 15.390? Actually, this is the same synthesis you posted Thursday for 15.389.Coincidentally, I combined BlinkerSpawn's predecessor from Friday + chris_c's junk maker to make 13 glider synthesis of 15.390: